54 ASTACID^. 



terna cleiite apicali acuto erecto ; parte externa apice incnrva, internam 

 tegente, dentibus duabus apicalibus corneis perparvis, coadunatis. 



Forma II. differt chela non barbata ; pedibus abdominalibus magis 

 cylindricis, basi articulatis, parte interna dente apicali extrorsum re- 

 curvo, parte externa dentibus non fusco corneis, majoribus, distantibus. 



Feniina diflfert chelis minoribus ; ventre inter pedes quartos Itevi, 

 annulo majori, ovali, sulco longitudinali, alternatim fisso. 



Long. 1.8 ; antenn. 1.3 ; ped. ant. 1.2. 



Habitat : Georgia ; Charleston, South Carolina. 



Animal paulo villosum. Vidi juniore.s rostro acutiori, ante apicem 

 utrinque dente acuto, pedibus maris abdominalibus dentibus magis ex- 

 pressis. 



The description of C. pcmcillutus LeConte differs somewhat. The 

 words, " Thorax lateribus granulatis," "brachio jjunctato, spinoso, tuber- 

 culato," do not answer very well to the single male. Forma I., which I 

 have seen. But I think the species the same. The tuft of hairs along 

 the inner margin of the hand is very striking. 



Cat. No. 250, Charleston, S. C, L. Agassiz. Male, female, young. 

 Spec. 8. 



Cat. No. 254, Charleston, S. C, Professor Baird. Male Form I. Fem. 

 Spec. 2. 



Cat. No. 279, Georgia, Dr. Jones. Male, young. Sjjec. 1. 



12. Cambarus WlEGMANNi Erichsou. 



Astacus Wiegmanni Erk-hson, Wiegm. Arch., T. 12, p. 99, n. 19. 



Figures on PI. III. 

 Anteimal lamina, fig. 151, a ; epistoma, h ; spine of the second joint of the exterior antenna, c. 



Fem. Rostro lato, modice longo, articulum antennarum secundum 

 vix superanti, piano, punctato, antice sensim angustiori, acumine subito 

 ac breviter triangulari, latitudine fere dimidio breviori ; marginibus 

 usque ad apicem elevatis ; cretis modice elevatis, postice divergentibus, 

 extus obsolete lineato-impressis, antice muticis. Antennis validioribus, 

 corpore brevioribus ; articulis basalibus dente parvo externo ; antennis 

 internis dente infero medio acuto ; lamina brevi, antice latissima, mar- 

 gine externo inflato, spina apicali brevi, acuta. Epistomate brevi, lato, 

 antice triangulari, acutiori ; pedibus maxillaribus intus dense, subtus 

 minus barbatis. Thorace elongato ovato, uljique punctato, lateribus 

 mesothoracis granulosis ; linea modica profunda, subsinuata, lateribus 

 divisa, apice mutica ; areola punctata, angusta, postice subito latiori. 

 Postabdomine thoracis longitudine, basi thorace latiori, subcompresso, 

 Itevi, postice angustiori ; segmentis anteapicalibus angulis externis ob- 

 tusis, subrotundatis ; lamina media parte basali apice utrinque bisijina 



